My thought about why it aint as easy as it seems :P
Give nt range advantage back and way to keep it- pvm nt can solo any mob. Pvp nt will kill any melee prof (if he can keep the range advantage- if he has it but cant keep it it will be same as its now)- and wont help against ranged. Give nt range advantage over ranged profs- and nt will kill any prof ingame (80 m range and Last Word memories anybody?). Give nt say -50% root immunity debuff- and ma/adv with 90% root immunity/root removers will still kill nt- while nt will garanteed to kill any keeper or ma/adv without all the way immunity. Still aint balancing just messing pvp more.
Give nt roots that actually work in pvp (in other words ones that ignore root immunity)- and melee will be garanteed to die against nt.
Generally like i said somewhere like a year ago and still saying it roots shouldnt been put ingame in first place- there is no way to balance them. Eather they work meaning godlike prof in pvm and in pvp against melee (nt vs ma before SL anybody?), or they dont work then prof based on them is nerfed (nt now...).
So to sum it up nt can forget about range advantage- giving reliable one will unbalance the game, and giving something that works but gives the other side a disent chanse will result in copy of existing range debuffs (and we all know how useful they are...).
The problem is that other ways aint exectly easy to balance too. Lets say that nt getting 1.5 k layer- in pvp it means nt absorbing most perks (sinse most dont hit above 1.5 k or just a little above)- and most burst/fling/ets. And sinse they are different dmg tipes it means nt immune to alpha from most profs- preaty much like acro profs- with the difference that sinse most AS aint capped unless coming from agent, nt will be close to immune to AS too. And nt can chain layers. Now add NS/IU to that and hello godmode...
And generally to whotever solution that will be added you need to add NS/IU combo- nt being fully immune to dmg/having high dmg/unresistable/ranged attack= godmode (for limited time) that needs to be considered for balance.
Probably only way to balance nt is capple of small changes like devs wanted- but seems there are two problems here.
First is that there is no reason why it should take months :P
Second is that so far dev solutions seems to ignore game content- +dmg on Dots with impossible to get alvls/fast dying mobs/uber NR mission mobs anybody?
Cant say that i have a solution but i guess a combo of say better evades buff/better mockery with sta/healdelta buff/resircling every 5 sec 725 layer can give a general guidelines. And say a +50% nanodmg constant selfbuff availible from lvl 150+ that only works in SL so that nt can get teams for lvling.